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Preparation of Papers in Two-Column Format for the Proceedings Of Proc. of the IEEE/OES Seventh Working Conference on Current Measurement Technology EddyNet: A Measurement Program for Collecting Real-Time Current Profiles from the Gulf of Mexico Steven P. Anderson Horizon Marine, Inc. 15 Creek Road Marion, MA 02738 (508) 748-1860 [email protected] Cortis K. Cooper ChevronTexaco, Exploration & Production Technology Co. 6001 Bollinger Canyon Rd, L-4240 San Ramon, CA 94583 David B. Driver BP America Inc. P.O. Box 3092 Houston, TX 77253-3092 Jan van Smirren Fugro GEOS Inc. 6100 Hillcroft (77081) PO Box 740010 Houston, TX 77274 Abstract—This paper describes the development and Eddy Joint Industry Project (EJIP) is a collaborative implementation of a measurement network that provides real- program, supported by several companies, that strives to time ocean current profiles collected from drilling rigs, effectively utilize limited resources to better observe and oceanographic survey vessels, and production facilities located understand the powerful currents found in the deepwater in the Gulf of Mexico. The Eddy Joint Industry Project Gulf. This paper reports on a recent EJIP initiative to developed the program, named EddyNet. This real-time develop a real-time measurement network that ties together network of observations improves the ability to analyze ocean current profile information collected by sites around the Gulf currents in the Gulf of Mexico and ultimately to support the and makes the data readily available to operators and forecasters. operational needs of deepwater hydrocarbon exploration and production. In addition, EddyNet provides a centralized II. BACKGROUND oceanographic database that can be used to develop environmental design criteria. The Loop Current (LC) is an energetic current of warm water that enters the Gulf of Mexico through the Yucatan I. INTRODUCTION Strait then loops around and exits the Gulf through the Florida Strait. Its position and strength change over time. Deepwater exploration and production of oil and gas is a Once or twice a year, the LC extends far north, and the loop complex endeavor that requires extensive planning and becomes so tight that it becomes a closed circulation, forming mitigation of risks to achieve success. One of the most an anticyclonic ring or eddy. Like the LC, these Loop productive deepwater regions is the Gulf of Mexico. It is also Current eddies (LCE) also have strong currents, but unlike a region where deepwater fields are collocated with regions the LC, they are not constrained to the eastern Gulf. Instead, of strong ocean currents especially those associated with the they are free to move west and north where they often Loop Current and its anticyclonic eddies. A good interfere with deepwater hydrocarbon exploration and understanding of these currents is crucial to safe operations production operations in the northern and western Gulf. Oil and design. industry activity in the Gulf continues to expand into deeper 0-7803-7813-X/03/$17.00 ©2003 IEEE Proc. of the IEEE/OES Seventh Working Conference on Current Measurement Technology water. As it does, it is increasingly exposed to the Loop monitor ocean current profiles locally. In addition, survey Current and associated eddies. vessels are sometimes equipped with ADCPs to monitor regions of strong currents “upstream” of a rig during critical Offshore operators in the Gulf often rely on a commercial operations. While some manual real-time data sharing of program called “Eddy Watch” to obtain operational these data is occurring, it is not consistent nor efficient. monitoring and tracking of the LC and LCE. This program, Finally, much of the data is lost after the operational value run by Horizon Marine, relies on data from air-deployed has been extracted despite the fact that the data is often useful drifting buoys combined with remote sensing and a few field for later design of production facilities. observations to track LC and LCE fronts and regions of strong currents. However, this system is somewhat limited In summary, EddyNet was designed to integrate existing because it provides regional scale analyses and tracks only ADCPs into a network that could be accessed in real-time surface currents (Figure 1). Historical data and experience with the goal of have shown that LC and LCE current profiles can vary 1. improving LC and LCE monitoring and forecasting substantially and this has a major effect on the forces for engineering operations, imposed on the rigs. In addition, strong mid-water current 2. documenting other potentially strong current events, events of unknown origin have been observed. These have 3. archiving data so it is not lost and is ready for little or no direct surface signature so are often undetected by comprehensive re-analysis, Figure 1. A chart showing the location of Millennium Eddy on 24 March 2001. Also shown are the seven-day buoy tracks and locations of active or planned offshore exploration and production sites. 29°N 28°N 27°N 26°N 25°N Buoy Drift Track Offshore Sites 24°N Frontal Features 94°W 92°W 90°W 88°W the standard Eddy Watch measurement devices. 4. providing real-time surface currents in support of oil spill tracking and search and rescue operations. Operators also use Acoustic Doppler Current Profilers (ADCPs) deployed on their drillships and platforms to EddyNet consists of an offshore component that is located Proc. of the IEEE/OES Seventh Working Conference on Current Measurement Technology at each offshore data collection site and an onshore from a serial data stream or from network file sharing, component that collects and manages the data collection leaving the existing computer system and software intact. and distribution. III. OFFSHORE COMPONENT To monitor serial data, a serial port splitter is used to allow a second computer running RTADCP to listen to the serial The offshore component of EddyNet includes the Real- data stream coming directly from the ADCP to the primary Time ADCP (RTADCP) software developed specifically for ADCP control/display computer. Serial data can also be EddyNet. RTADCP accesses data from the ADCP at user- transmitted using RDI Transect software that is configured defined intervals, adds additional information (such as site with the "ensemble-out" function to send data out through a name, water depth, and position), and formats the data into second serial port on the primary ADCP control computer to RD Instruments Broadband ADCP file format. RTADCP a second computer with the RTADCP software. then transmits the data files to the onshore EddyNet server through existing Internet connections or a stand-alone Iridium Alternately, RTADCP can be configured to monitor raw satellite data services link (Figure 2). ADCP binary files through network file sharing. In this case, the primary ADCP control computer is configured to share The first requirement for RTADCP was to assure that the the directory containing the ADCP data files being collected. new software did not noticeably alter the existing ADCP RTADCP is then configured to monitor this directory monitoring system. The operators wanted to be sure the remotely and check for new ensembles at user defined ADCP systems continued to be reliable and accessible to intervals. (Note that this configuration is not possible if the individuals in the field. Thus, RTADCP is configured to primary control computer is operating in a DOS acquire the raw ADCP data on a secondary computer, either environment.) Data Transmission Stand-alone Iridium Satellite Modem or Existing Ku-Band Network System FTP Server Computer running RTADCP software EddyNet Data Processor Archive Broadband ADCP Data Processing Web Server Center Drillship, Survey Vessel, or Platform Web Site Real-time graphics and data Forecasters and EddyNet Members Figure 2. Flow diagram showing integration of EddyNet offshore and onshore components. Proc. of the IEEE/OES Seventh Working Conference on Current Measurement Technology Figure 3. Example of ADCP data from RDI 38 kHz ADCP operated by BP America Inc. and deployed on the Transocean Discoverer Enterprise. over an independent network. In the case where existing The second requirement for RTADCP was to use a data networks are unavailable, an Iridium Satellite LLC data format that included site-specific meta-data while transmission system can be used. The Iridium system uses a maintaining compatibility with existing RDI data analysis Motorola 9500 Portable Phone, Motorola 9570 Portable software. The decision was made to use the RDI Broadband Dock, and a data kit. Data is transmitted using either dial-up data format for the ensemble data where each ensemble or Iridium direct Internet services. includes a header, a fixed leader, a variable leader, and velocity profile data as described in the RDI Technical IV. ONSHORE COMPONENT Manual [1]. RTADCP then creates EddyNet specific leader data that is appended to each ensemble. The EddyNet leader The onshore component of EddyNet includes the software, block includes ancillary data including the location of hardware, and network resources required to acquire, archive, measurements, the type of instrument, the platform name, the analyze, visualize, and distribute the real-time data. It also operator's name, the water depth, and the time zone used for includes the EddyNet program administration and time stamping. A unique leader block ID number identifies accounting. the EddyNet leader block. In this configuration, existing RDI software is able to display the current profile data in EddyNet The EddyNet server continuously receives and archives data files; however, it will ignore information within the data from the offshore sites. Most of the data is received EddyNet leader block. directly through the Internet using a file transmission protocol (ftp) server. The EddyNet ftp server is located at an Internet After acquiring and reformatting the original data, the data processing center that provides 24-hour support and RTADCP software transmits that data to the server located server redundancy. Throughout the day, the EddyNet server onshore.
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